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KLEINFELDER <br /> File No. 20-2983-03 <br /> October 26, 1990 <br />�I <br /> F� <br /> 3 . "Review Committee Report On Evaluation of <br /> FSources of Nitrate in Groundwater of the Chico <br /> Urban Area, " Butte County, dated September 26, <br /> F. 1989. <br /> F4 . A Review of the Nitrate Problems in the <br /> Groundwater of the Santa Ana region and Their <br /> Relationship to High Density Developments on <br /> Septic Tank-Subsurface Disposal Systems, dated <br /> September 8 , 1989, by the CRWQCB, Santa Ana <br /> region. <br /> FAccording to our review of the above references and our discussions <br /> with Mr. Dykstra, the "Hantzche" mass balance equation is one means <br /> of -estimating nitrate concentrations in groundwater. In the CRWQCB <br /> ' report on nitrate concentrations in the Chico area, this formula <br /> F4was found to be sensitive to flow figures, home occupancy levels, <br /> ' <br /> and denitrification rates. The "Hantzche" equation is presented <br /> below with an explanation for each factor. <br /> F <br /> Nc = AW x Nw (1-D) + r (Nb) <br /> F AW + r <br /> Where: NC is the nitrate concentration in ground water <br /> resulting from domestic sources and precipitation - <br /> mg/1 Y <br /> A is the number of dwelling units per acre on septic <br /> tanks - unit/acre ` <br /> W is the annual wastewater loading per dwelling per x <br /> acre - inches <br /> { Nw is the nitrate concentration of nitrified leach <br /> field effluent - mg/1 <br /> F <br /> F <br /> Copyright 1990 Kleinfelder, Inc. 3 <br /> i + <br />